Telephony.



M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. I913.

1,230.1"?0. Patented June 19, 1917.

1 SHEETS-SHEET INVENTDR MORTON L. JOHNSON ATTQRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. ms.

Patented June 19, 1917.

7 SHEETS-SHEET 2.

W'ITNESSE INVENT-GR MORTON L. JOHNSON ATTORNEY M. L. JOHNSON.

TELEPHONY. I APPLICATION EILED APR. 5, m3.

Patented June 19, 1917.

ISHEETS-SHEET 3.

INVENTOR M'ORTONL. JOHNSON ATTGRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. I913.

l ,239, 1 70. Patented June 19, 1917.

7SHEETS-SHEET 4.

INVENTOR MORTON L. J OHNSON ATTORNE M, L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5, I913.

Patented J une 19, 1917 ISHEETS-SHEET 5.

WITNESSES INVENTOR 5 MORTQNLJOHNSQN g g x0449 AT T URNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. 1913.

1,230, 1 70. Patented June 19, 19w.

ISHEETS-SHEET 6.

WITNES 1 v I NTUR MORTONLII JOHNSON ATTUEY M. L. JOHNSON.

TELEPHONY.

7h .1 H Ow 1 A H m J 0% 4w] H .m ow D1 2w 0 .m mm P A D E IL H N w T A cU P P A PEG; 7

WITNESSES INVENTOR MORTONLJQHNSQN d ATTORNEY entra n snares area anion.

MORTON L. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,TO FRANK B. COOK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

TELEPHONY.

Specification of Letters Patent.

Patented June 19,1991 7.

Application filed April 5, 1913. Serial No. 759,026.

T 0 all whom it may concern:

Be it known that I, MORTON L. JOHNSON, citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Telephony, of which thefollowing is a full, clear, concise, and exact description, referencebeing bad to the accompanying drawings, forming a part of thisspecification.

My invention relates to telephone exchange systems and in one of itsaspects relates to that class of telephone exchange systems in whicheither or both responsive devices and link connectors are automaticallyconnected with calling lines and when the invention is embodied in atelephone exchange system having such characteristics or any of them theinvention includes means whereby calling lines may have delayed accessto such responsive devices or link connectors when denied immediateaccess thereto during the presence of the peak of a traflic load wherebythe calling subscribers are not put to the burden of reinitiating theircalls and, by the nature of .the apparatus which is preferably employed,such calling subscribers whose connections are being delayed will haveaccess to the responsive devices or link connectors when they are freedprior to subscribers later initiating the calls, though obviously theinvention is not to be limited to this characteristic.

Certain features herein shown will form the subject matter of a divisionof this application to which claims originally contained in the presentcase are to be transferred.

I will explain my invention more fully by reference to the accompanyingdrawings in which Figure 1 is a general diagramnzatic view illustratingcharacteristics of the invention, circuits being suggestivelyillustrated instead of being fully illustrated, in order that thegeneral nature of the invention may be made more clear; and Figs. 2, 3,t, 5, 6 and 7 taken collectively, and in numerical order with theconductors at the long marginal sides of the sheet in alinement,illustrate more in detail one embodiment of the invention, to whichembodiment, however, the invention is not to be limited.

Like parts are indicated by similar char acters of reference throughoutthe different figures.

Referring first more particularly to Fig. 1, subscribers stations 201and 202 are provided with selector switches A that are individualthereto and which, in the embodiment of the invention illustrated,include traveling wipers and waiting contacts that are contained incircuits established between subscribers though this characteristic ofthe system may be modified. As exhibited, the waiting contacts of theselector switches A that are included within the normal range ofoperation of the wipers of these selector switches constitute terminalsof link connectors which may be described as answering terminals of suchlink connectors, the connecting ends of the link connectors beingprovided with operator controlled terminals such, for example, as theconnecting plugs 1. Where, these connecting ends of the link connectorsare in the form of plugs the lines are provided with jacks 2 which maybe multipled before the various operators positions, whereby connections'may be completed between calling and called lines. As illustrated, thelink connectors of each group at eac h operators position is providedwith some form of responsive. device such, for example, as an operatorstelephone 3, this responsive device being common to the link connectorsand so controlled that it is limited to association with one callingline at a time and is freed when the operator has attended to theconnection desired. The wipers of each selector switch A are adapted toextend beyond their normal range of travel and in so doing to leave thewaiting contacts that constitute the answering ends of the aforesaidlink connectors to move over other waiting contacts that constituteterminals of conductors having complemental multiple terminals formingparts of finder switches B, B, B. In Fig. 1 the waiting contactsencountered first by the wipers in moving in a clockwise direction arethe answering ends of the link connectors which terminate in the plugs 1while the lower waiting contacts are connected with the waiting contactsof the switches B. The wipers of these latter switches constitute orinclude what may be said to be the answering terminals of linkconnectors which are here shown as terminating in especially providedplugs 4, 4, though the invention is not to be limited to the employmentof plugs 4, 4, supplied in addition to the plugs 11, the additionalplugs 4, 4 being shown mainly for the sake of simplicity. The conductorsextending from the switches A to the waiting contacts of the switches Bare further extended into connection with relay mechanism indicated at Cwhich are employed for setting an idle switch D into operation, one ofthese switches being thus set into operation when a selector switch Aselects an idle relay mechanism C. The switches D constitute subselectorswitches in that they perform a very important function of the mainselector switches A when these latter switches are working within theirnormal range of operation, namely the selection of an idle responsivedevice 3, switches D operating for this purpose through theintermediation of relay mechanism E. When an idle responsive device isselected relay mechanism F individual thereto is set into operation forsetting a switch B into operation, the wipers of the switch B set intooperation becoming electrically connected with the conductor thatcouples the calling line with the relay mechanism C whereby such callingline is extended into connection with the connecting terminal 4individual to the operating switch B and the operators telephoneequipment 3 common to the group. of link connectors including suchconnecting plug 4. The switches B are preferably arranged in pairs eachpair having relay mechanism F common thereto whereby, if one switch B ofa pair is busy, its companion may be selected. By the equipment thus farvery generally illustrated and described it is apparent that callinglines are adapted to be extended directly into connection with linkconnectors or responsive devices common to groups of link connectorsduring the normal traffic conditions of the system. If there should bemomentary excessive trafiic in the system the calling subscribers thatoccasion the excess will be thrown into association with the conductorsleading to the switches B and the relay equipment C so that the callingsubscribers will set the switches D into operation, such operationcontinuing until a responsive device 3 has become free whereupon theswitches D will cease their operation and effect the extension of thecalling subscribers lines into connection with the connecting plugs(here shown as extra plugs 4) through the agency of switches Bpertaining to such plugs, these plugs and switches being individual tothe responsive devices 3 that are selected by the switches D. Thewaiting contacts of the switches D being restricted in number in thepreferred embodiment of the invention, even though the system is large,the

waiting calling subscribers who are associated with such switches D aremost likely to become associated with responsive devices 3 before othercalling subscribers can be come associated with such responsive deviceswithin the normal range of operation of their selector switches A.Signals G serve to indicate to an attendant the number of calling lineswaiting for connection with responsive devices 3. Signal lamps Hindividual to the switches D, when constantly glowing indicate thattheir switches D are in constant operation, showing to an attendant thatno responsive devices 3 are being selected. Each time a signal H ceasesto glow it indicates that the associate switch A has made a selection ofa responsive device 3. Signal lamps T, individual to switches B andtheir plugs 4, are caused to glow when their corresponding plugs 4 aretaken for use by the operator and preferably when such plugs areinserted within the jacks of called lines. Counting devices K areindividual to the operators positions,

the plugs 4 at each position and the link connectors of which theseplugs form parts having a counting device K common thereto. Thesecounting devices serve to integrate or totalize the connections made atthe operators positions by the plugs 44. A totalizing count L sums thecounts made by the counters K. Counting devices M individual to theoperators positions serve each to count all the connections made at theposition pertaining thereto including those connections made by way ofthe plugs 1 and those made by way of the plugs 4. A totalizing count Nserves to sum the counts made by the counters M. The rate of totaltraffic at different portions of the day at the different operatorspositions may be determined with the aid of time counters O operated bya timing device P and electro-magnetic inking devices Q also controlledby the timing device P, the elements 0 and Q operating upon tapes R tomark the time thereupon. Connection counters S are in multiple with thecounters M and co operate with the elements Q to record the counts uponthe tapes B. An extra time counter T cooperates with a totalizingcounter U and extra electro-magnetic inking devices to totalize theconnections of all of the operators positions upon a tape W.

The apparatus illustrated at X includes elements similar in function tothe elements 0, Q, R, S, T, U, V, and W excepting that the apparatus atX is employed to count the connections made by way of the plugs 4.

Referring now moreparticularly to Figs. 2 to 7 inclusive, I willdescribe more in detail the equipment entering into the preferredembodiment of the invention. The equip ment at each of the telephonestations 201 and 202 includes a telephone switch hook 5,

a call bell 6, condenser 7, telephone transmitter 8, and a telephonereceiver 9, the switch hook having a normal contact for normallyconnecting the bell bridge between the sides of the associate telephoneline and an alternate contact for connecting the telephone receiver andtransmitter between the sides of the associate telephone line when thereceiver is removed from its switch hook. The sides of each telephoneline terminate in the armature switches of a cutoff relay 10, the linesides being normally continued by way of the normal contacts of thearmature switches of the relay 10 into connection with the two upperarmature switches of a switching relay 11 and by way of the normalcontacts of these two upper armature switches intoconnection with thegrounded coils of a line relay 12, the upper coil of this line relaybeing grounded'through a com mon battery 13 while the lower coil isdirectly grounded. When a calling subscriber removes his telephonereceiver from its switch hook the circuit normally opened at theassociate condenser 7 is closed through the telephone bridge containingthe trans mitter 8 and receiver 9 whereby the line relay 12 isenergized. When this relay 12 is energized its upper grounded armatureswitch engages its contact to close circuit through the motor magnet 14,the interrupter relay 15 and its armature switch, the side switch wiper16 in its first position, and the grounded common battery 13. The m0-tor magnet 14 will continue in, operation until the wiper 17 engages anungrounded waiting Contact whereupon circuit through the private magnet18, which was initially closed by the motor magnet 14, is opened to stepthe side switch wipers 16 and 19 into their second positions, the wiper16 in its second position opening the circuit of the motor magnet 14whereby the wiper 17 is maintained at rest and the wipers 20 and 21coupled with the wiper 17 are also brought to rest in engagement withwaiting contacts that are either the answering terminals of the linkconnectors having the connecting plugs 1 or are the terminals ofconductors extending to the switches B, according to the extent ofmovement of the wipers. The waiting contacts connected with the plugs 1are, of course in excess of the waiting con tacts that pertain to therelay devices C and are encountered first in the travel of the wipers17, 20 and 21. The waiting contacts of the various primary selectorswitches A which are similarly positioned are in multiple connection andeach set of multiply connected waiting contacts are either connectedwith a plug 1 individual thereto or a set of conductors pertaining to arelay organization C so that any switch A has access to any plug 1 inany operators position in its normal range of operation and in itsincreased range of operation is adapted to have association with anyrelay organization C. Referring now more particularly to therelationship of the connecting plugs 1, the ground upon the waitingcontacts of the wipers 17 is present when the responsive devicesindividual thereto are not free for selection and while the desiredconnections remain uncompleted. vWhen the connections have beencompleted such ground is established at the lower armature switch ofrelay 31. When a particular responsive device has been selected and whenany of the link connectors of the group to which this responsive deviceis common is free for selection the grounds are absent at 22 and 31 sothat the circuit of the private magnet 18 is opened under thecircumstances above described. When the side switch wiper 16 is broughtinto its second position a circuit is established traceable from thecommon grounded battery 13, said side switch wiper in its secondposition, the winding of the switching relay 11, to the upper groundedarmature switch of the relay 24 and the con tact then engaged thereby.The two upper armature switches of relay 11 now en gage their alternatecontacts to extend the sides of the calling line into connection withthe wipers 20 and 21 and portions of the selected link connectorextending from the waiting contacts engaged by the wipers 20 and 21. Therelay 24, in its energized condition, serves to place ground upon thewiper 17 by way of the side switch wiper 19 in its second position andthe upper grounded armature switch of relay 24 to prevent the intrusionof another switch A upon the waiting contacts that have beenautomatically connected with wipers 17 20 and 21. When relay 11 isenergized the circuit of the relay 24 is opened so that the ground lastmentioned is removed. This ground is replaced at 22, Fig. 6, when theresponsive device or operators telephone 3 is selected and prior to thecompletion of the connection desired. The operators telephone outfits 3distributed among their positions are associated each with a relay 25(Fig. 6) individual thereto and whose circuit is established over acalling line by a path traceable from the grounded battery 13, the righthand winding of the relay 25, the upper armature switch of relay 26 andits normal follow-up contact, the waiting contact engaged by the wiper20, the upper armature switch of relay 11 and its alternate contact, theupper armature switch of relay 10 and its normal contact, one side ofthe calling line, the other side of the calling line, the lower armatureswitch of relay 10 and its normal contact, the inter mediate armatureswitch of relay 11 and alternate contact, the wiper 21 and the contactengaged thereby, the intermediate armature switch of relay 26 and itsfol- 13o low-up contact, the relay 27 the left hand winding of relay 25,to ground. Re-

lay 27 operates to establish a signaling circuit through the signaldevice 28 indi vidual to the plug 1 so as to inform the operator whichparticular link connector has been automatically selected. The relay 25is energized to attract its armature switches, a circuit beingestablished traceable from the grounded battery 13, the relay 29, theright hand armature switch of relay 25 and its alternate contact, toground. The relay 29 is provided with as many grounded armature switchesas there are plugs 1 in the group of link connectors to which the relay29 is common and these armature switches, when attracted, serve to makethe link con nectors of a group unselectable whether such linkconnectors are taken for use or not, while the relay 25 is energized,this relay being energized for the purpose of associating the responsivedevice 3 pertaining to this group of link connectors with the callingline, the responsive device or telephone 3 being connectedin bridge ofthe conductors leading to the relay 25. The ground established upon thelink connectors is traceable from the grounded armature switches 22 tothe lowermost armature switches of re: lays 26 by way of their contactsthence to the waiting contacts of the wiper 17 in the various switchesA, the ground removed at the upper armature switch of relay 24 thusbeing replaced. Any other calling line is now prevented from selecting alink connector in the group to which the telephone 3 is common whilesuch telephone is in service to enable the operator to attend to thecall being initiated. The subscriber having informed the operator of theconnection desired the operator will take the plug 1 and apply its tipto the thimble of the jack of the called line. If the line is idle thereis no test manifestation. If the desired line is another calling linethe testing coil 30 of the operators receiver is included in the testingcircuit that may be traced from the grounded coil 30 through theuppermost ar mature switch of the relay 31 and-its normal contact, theupper normally connected pair of contacts of the ringing key 32, the tipof the testing plug 1, the thimble of the tested jack, the upperarmature switch of relay 33 and its alternate contact, the resistancecoil 34, to the grounded battery 13, whereby a busy manifestation occursin the operators receiver. If the desired line is another called linethe test circuit instead of continuing by way of the upper armatureswitch of the relay 33 continues by way of the heel of the plug insertedin such other called line thence to the relay 31 and the groundedbattery 13 pertaining to the plug in the jack of the tested'called line.

Assuming that the line desired is idle,

the operator will insert the plug 1 in a jack of a called line or in anyother suitable way will bring the selected link connector intoconnection with the called line whereupon the relay 31 is included in acircuit trace called line is disconnected from the called line so thatwhen the called subscriber responds his selector switch will notoperate. lVhen the relay 31 is thus energized its grounded lowerarmature switch establishes a circuit traceable from this switch throughthe winding of relay 26 to the grounded battery 13 thus energizing therelay 26 whose two upper armature switches leave their normal follow-upcontacts and engage their alternate contacts. These armature switches inleaving their follow-up contacts open the circuit of the relay 25 sothat its armature switches are released whereby the circuit of the relay29 is opened to remove the ground at 22 from association with the linkconnectors in the group containing'the employed plug 1 whereby theoperator's telephone or responsive device 3 is reduced to a selectablecondition. When the two upper armature switches of relay 26 engage theiralternate contacts circuit is closed through relay 34: by a path whichis now apparent and that includes the calling line. At the same time thecircuit of the signal device 28 is opened. The relay 3a is thus governedby the calling subscriber and has as one of its functions the governmentof the circuit of a calling subscribers supervisory signal 35. When thecalled subscriber has responded to the ringing current impressed uponhis line following the depression of the key 32 an energizing circuit isestablished for the relay 36 by way of the called subscribers line andthe bridge at the called subscribers station that includes the telephonereceiver and transmitter. The relay '36 is thus within the control ofthe called subscriber and has for one of its functions the government ofa circuit for the which, when depressed, serves to establish a circuitfor the relay 29 by a path which includes the upper grounded contact ofthe listening key 38 and other connections which are apparent. When therelay 29 is energized it operates to prevent any other calling line fromselecting the operator who is listening into an established connectionby means of the key 38. When the subscribers are through theirconversation and the plug is removed from the jack the released relay 31removes the ground at its lower armature switch from the multiplyconnected buttons at the wipers 17 of the diiierent switches A, theremoval of this ground opening the circuit of the relay 11 whereupon thearmature switches of this relay are restored to normal. The lowergrounded armature switch of relay 11 will thereupon establish a'circuitfor the release magnet 39 that includes the previously closed off normalswitch 40 whereby the wipers of the employed switch A are restored in acounter clockwise direction to normal. The side switches 16 and 19 atthe same time are placed in their first posi-' tions.

If the operators happen to be fully taxed at any period during theoperation of the exchange the selector switches A of calling subscriberswho attempt to initiate calls during such time will pass beyond thewaiting contacts that are connected with the plugs 1 and will move overthe additional contacts that are associated with the relay equipment Cby the conductors intervening between such relay equipment and suchadditional waiting contacts. The selector switch set into operation byany such calling subscriber will cease its movement when the wiper 17engages the unground ed contact individual to some relay mechanism C,each of the relay mechanisms C have a group of similarly posi tionedmultiply related contacts distributed among the banks of waitingcontacts of the wiper 17 of the different selector switches A. When thewiper 17 engages such an ungrounded waiting contact the wipers 20-and 21are broughtto rest when the wiper 17 and the calling line is extendedinto connec tion with the wipers 20 and 21 to bring the relay 41 into aclosed circuit that includes the calling line. The relay 41 of theselected relay mechanism C thereupon attracts its armature switches, theintermediate armature switch of relay 41 places the ground upon thewaiting contact with which the employed wiper 17 is in engagement toreplace the ground removed at the upper armature switch of relay 24. Theupper armature switch of energized relay 4E1 closes an apparent circuitthrough the relay 42 that is common to the relays 41 of a group of relayequipments C. In Fig. 1 there are four relay equipments C illustrated,the two upper relay equipments pertaining to one sub-selector switch Dand the two other relay equipments pertaining to another selector switchD so that each selector switch D pertains to the group of lines having apair of relay equipments C, as the system is shown. It is not desirableto have two switches D operate at the same time, hence the controllingcircuit of either switch must be closed by the other when idle and openwhen the other is in operation. The controlling circuit-of the lowerswitch D is governed at the right hand armature switch o relay 4% of theupper switch D and the controlling circuit of the upper switch D iscontrolled at the right hand armature switch of the relay 44 of thelower switch D. lhe relays 16 of the two switches D are in parallelrelation when the wipers 49 happen to be simultaneously connected withthe same multiply related contacts so that the relay 46 of the switchsecond to operate will not be sufiiciently energized owing to itsparallel relation with the other relay 46 to cause its wiper 49 toremain at rest in connection with the waiting contact in multiple withthe contact engaged by the wiper 49 of the first switch D. Relay 42establishes a circuit traceable from its grounded armature switch, thecontact then engaged by such switch, the relay 43, to the groundedbattery 13. The relay 13 attracts its armatures witch which is groundedto establish a circuit traceable from this switch, the contact of thisswitch, the right hand armature switch of relay 4A and its normalcontact, the relay 45, to the grounded battery 13. The left handgrounded armature switch of relay 45 thereupon establishes a circuittraceable from this grounded armature switch, the contact of thisswitch, the armature switch of relay 46 and its contact, the motormagnet 4:7, the armature switch of interrupter relay 48, the relay 48,to the grounded battery 13. The motor magnet d6 is shown as beingequipped with a ratchet wheel 48 that is in actuating relation with thesingle wiper 49 of the associate subselector switch D, this wipercontinuing in rotation until it engages a waiting contact with which thegrounded battery 13 has been connected, whereupon the relay 46 will beenergized to open the circuit of the motor magnet 47 permitting thewiper. 49 to re main at rest. The waiting contacts of each switch D areindividual to the difierent operators positions, similarly positionedwaiting contactsof the two switches being in multiple connection. Thecircuit relation of each waiting contact of the switch D with theequipment of the operators position to which such waiting contact isindividual is controlled by the right hand armature switch of the relay25. \Vhen an operator at a position is free for selection her relay 25individual to her posi tion is deenergized so that the right handarmature switch is capable of placing the battery 13 upon thecorresponding waiting contacts of the switches D by a path that includesthe grounded battery 13, the relay 29, the right hand armature switch ofrelay 25, the normal contact of this armature switch and the relay F.When the battery 13 is included in circuit with the relay &6 the relaysF and 29 are energized, the functions of the armature switches of therelay 29 having hitherto been explained. When a relay F is energized(there being one 'such relay individual to each responsive device 3) acircuit is established traceable from vthe grounded contact of thearmature switch of relay F, said armature switch, the uppermost armatureswitch of relay of a switch 13 belonging to the energized relay F, theupper armature switch of relay 51 and its contact, the relay 52, to thegrounded battery 13." The left hand armature switch of relay 52thereupon closes circuit for the motor magnet 53, an interrupter relay54:, the side switch wiper 55 in its first position, and the groundedbattery 13. The motor magnet 53 continues to operate to drive the wipers56, 57, 58 and 59 until the wiper 58 finds an ungrounded contactwhereupon the private magnet 60 which was initially energized by themotor magnet 53 is included in open circuit to move the side switchwipers 55, 61 and 62 to their second positions, the side switch wiper 55in its second position opening the circuit of the motor magnet 53 topermit the wipers 56, 57, 58, 59 to remain at rest. A side switch wiper55 in its second position establishes a circuit for the relay 5Otraceable from the grounded battery 13, the side switch Wiper 55 in itssecond position, the relay 50, the side switch wiper 62 in its secondposition, the right hand armature switch of relay 52, to the groundedcontact of this armature switch. The energized relay 50 opens a circuitfor the relay 52 and the ground previously established at the right handarmature switch of this relay 52 upon the wiper 59, being new removed,is elsewhere replaced. The ground connection established upon the wiper59 serves to complete the circuit for the switching relay 63 of therelay equipment C. The two upper armature switches of the relay 63 leavetheir follow-up normal contacts and engage their alternate contacts toconnect the wipers 56 and 57 with thecalling line, the connection of thecalling line being further extended by way of the intermediate armatureswitches of the relay 50, when attracted. Thecontacts of theseintermediate switches of the relay 50 are connected with the two upper,armature switches of relay 26 of a link connector having a connectingplug 4. The calling line is neeeaao extended by way of the normallypositioned upper armature switch of relay 26 and their normal follow-upcontacts into connection with the relay 25 individual to the selectedoperators responsive device. The relays 25 and 64: are now in closedcircuit with the calling line. Relay 25 opens the circuit for thepreviously energized relay F, the circuit for relay 29 at the same timebeing preserved at the alternate contact for the right hand armatureswitch of relay 25 which engages this alternate contact before it leavesits normal follow-up contact so that the link connectors of the grouphaving the selected responsive device 3 are not' subjected to selectionfor the time being. lVhen the circuit for the relay F is thus opened itsarmature switch opens a circuit for the relay 52 so that when the relay50 is energized the circuit for the relay 52 of the switch B companionto the operated switch 13 will not be operated. If another call of thekind being described should be initiated while the switch B is employedthe companion switch B will be of service owing to the closed circuit ofthe relay 52 of the second switch B established at the upper armatureswitch of the relay 50 of the first switch B and its alternate contact,this circuit also including the upper armature switch of the relay 50 ofthe second switch B and the contact then engaging the same. When therelay 64 is energized a circuit is established by its upper armatureswitch for a calling signal device 65 individual to the selected linkconnector extending to the plug 4-, the signal device 65 performing afunction similar to that of the signal device 28. The intermediatearmature switch of relay 64: places a ground upon the wiper 59 by way ofthe contact engaging the same to replace the ground previously removedat the right handarniature switch of relay 52 for the purpose ofmaintaining the relay 63 energized. The lowermost grounded armatureswitch of the energized relay 63 establishes ground upon the contactengaged by the employed wiper 17 and other contacts in multipletherewith for preserving the circuit of the relay 11 and also forpreventing other switches A from resting in connection with these samewaiting contacts. Other features of the link connectors terminating inthe plugs 4 are similar to features of the link connectors terminatingin the plugs 1 and similar parts having similar functions are givensimilar characters of reference. The

' subscriber having informed the operator or the number desired theoperator will first test the desired line in the same manner in whichthe desired line was tested with a connecting plug 1 and with similarresults. Assuming the desired line to be idle, the operator will insertthe plug 4 in the jack of such line with similar resul is as hithertodescribed in connection with the use of a plug 1 and will signal thecalled subscribers by depressing the ringing key 32. When bothsubscribers connected by way of the plug 4 are and to restore theequipment of the calling line to normal in the manner previouslydescribed. The lowermost armature switch of relay 50 of the employedswitch B when released establishes circuit for the release magnet 51which causes the wipers 56, 57, 58 and 59 and the side switch wipers 55,61 and 62 to be restored to normal. It may be added that I prefer toemploy a tone device 66 which is constantly operating and in a circuitwhich is intermittently interrupted by the device 66, this circuit beingin inductive relation with the circuit that includes the relay 12 or therelay 41 and the calling line. The tone device causes a mani- :testationin the calling subscribers telephone until a responsive device 3 hasbeen selected whereupon such tone device is excluded from circuit owingto the exclusion of the relay 12 or the relay 41 as the case may be.

The lowermost armature switches of the relay 41 control the circuits ofthe signals G by circuits which are apparent, these signals serving toindicate to the operator the number of overflow calls which have beenunattended to, the signal lamps glowing until the calling lines inassociation therewith have become connected with overflow plugs 4 orresponsive devices 3. During the operation of either switch D its relay44 isv energized, the left hand armature switch of such relaymaintaining the circuit for the associate signal H closed while theassociate switch D is in operation. The attendant will observe the lampat H and will note that when it is not glowing the switch D is unable tofind an idle responsive device 3. The lower armature switches of therelays 31 individual to the link connectors having the plugs 4 serve,when attracted, to establish the circuits for the signal devices Iindividual to plugs 4 so that an attendant will know the number ofconnections being maintained by way of the overflow link connectorshaving the plugs 4, the signal devices T glowing during the maintenanceof the connections eflected by means of the plugs 4.

The lowermost armature switches 64 in dividual to the overflow plugs 4,when attracted upon selection of idle responsive devices 3, serve toestablish circuit for why 67 which is common to the overflow plugs 4 ateach position. The circuit for the relay 67 is opened when the plug 4corresponding tov the energized relay 64 is inserted in the jack of 21called line. When the relay 67 is energized its armature switch engagesits alternate contact to establish circuit for a sluggishly operatingrelay 68. When the relay 67 is denergized its armature switch engagesits normal contact to establish a circuit in cooperation with thearmature switch of the sluggishly operating relay 68 that includes thecounting device K individual to the position having the relay 67. Thedrawing indicates three counters K which may be of any usual orpreferred totalizing or integrating character, there being one suchclement K for each operators position to record the number ofconnections established at each operators position by way of theoverflow plugs 4 at such position. A summation counter L totalizes thecounts made by the three counters K being operated. The counters M areindividual to the diflerent operators positions and the responsivedevices 3 thereat to record the total number of connections made by theplugs 1 and 4 at each position. This result is secured by the left handarmature switch of relay 25, when attracted, upon the selection of aresponsive device 3, and the subsequent release of this armature switchwhen any plug is inserted in a jack, this armature switch in beingreleased cooperating with the armature switch of the sluggishlyoperating relay 69 to close circuit through the counting mechanism Mpertaining to the group of plugs 1, 4 having the relay 25. The relay Nserves as a summation device to totalize the counts made by the severalcounters M. The magnets S are in multiple with the magnets M, whichmagnets S operate printing wheels that serve to indicate the number ofcompleted connections efl'ected at the operators positions to which themagnets S are individual. The magnet U forms a part of a summationdevice operated each time a magnet S is operated to adjust a printingwheel to totalize the con nections made at all operators positions. Theprinting magnets Q and V cooperate with the magnets S and U to print therecord upon the tapes R and W. The printing devices having the magnets Oand T serve to record-the times upon the tapes R and W, the magnets Oand T and the magnets Q and V being timed in their operation by a timingdevice P. The devices indicated at X are" controlled similarly to thedevices 0, Q, S, T, U and V to record the connec tions made and the timeduring which such connections are made with the aid of the overflowequipment, the circuit relating between the devices at X and the devicesK, L being similar to the circuit relations thatexist between thedevices M, N and the recording devices 0, S, etc. The elements K, L, M,N, S, T, etc., are jointly controlled by the calling subscriber andoperator so that the operator is not able to eflect the counts withoutthe aid of the calling subscriber, this being one object of my presentinvention irrespective of the means employed for effecting theassociation between the telephones of calling subscribers and theoperators and for e ecting connection between subscribers. I do not wishto be limited, however, to the employment of the calling subscribersline that operates in combination with the operators equipment for accomplishing this result.

In the claims I use the term telephone line extensions meaning therebyadditional connections supplied to telephone lines for operatingpurposes such, for example as the extensions which couple the responsivedevices 3 with calling lines or the extensions which couple theconnecting plugs or other connecting devices with calling lines.

While the selector switches A are shown as being individual to the linesand while these selector switches remain in the connection establishedbetween calling and called stations and while they are employed toselect idle responsive devices associated with link connectors I do notwish to be limited to these various characteristics nor do I wish to belimited to other details of construction and circuit arrangementillustrated as changes may readily be made without departing from thespirit of the invention, but having thus described my invention 1 claimas new and desire to secure by Letters Patent the following 1. Atelephone exchange system including telephone lines extending fromstations to an exchange; operators responsive devices; automaticallyoperating switches for connecting calling telephone lines with idleoperators responsive devices; and additional automatically operatingswitches selectable by thev aforesaid automatically operating switcheswhen all of the responsive devices are in service and operating toconnect operators responsive devices with calling lines when suchoperators responsive devices are freed.v

2. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group; automatically operating switches for connectingcalling telephone lines with idle operators responsive devices; andadditional automatically operating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive devices withcalling lines when such oper ators responsive devices are freed.

3. A telephone exchange system including telephone lines extending fromstations to an exchange; .extensions for said telephone lines;automatically operating switches for connecting calling telephone lineswith said extensions; and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe line extensions have been appropriated and operating to connecttelephone line extensions with calling lines when such extensions arefreed, there being means operated by the additional automatically operating switches for connecting the extensions with calling linesindependently of the ad ditional automatically operating switches.

l. A telephone exchange system including telephone lines extending fromstations to an exchange; operators responsive devices; automaticallyoperating switches for connecting calling telephone lines with idleoperators responsive devices; and additional automatically operatingswitches selectable by the aforesaid automatically operating switcheswhen all of the responsive devices are in service and operating toconnect operators responsive devices with calling lines when suchoperators responsive devices are freed, there being means operated bythe additional automatically operating switches for connecting theoperators responsive devices with calling lines independently of theadditional automatically operating switches.

5. A telephone exchange system including telephone lines extending fromstations tb an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group; automatically operating switches for connectingcalling telephone lines with idle operators responsive devices; andadditional automatically operating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive devices withcalling lines when such operators responsive devices are freed, therebeing means operated by the additional automatically operating switchesfor connecting the responsive devices with calling lines independentlyof the additional automatically, operating switches.

6. A telephone exchange system including telephone lines extending fromstations to an exchange; link connectors for constituting extensions ofcalling telephone lines and serving to connect calling telephone lineswith called telephone lines; automatically operating switches forselecting idle link connectors and connecting them with ca1lingtelephone lines; and additional auto matically operating switchesselectable by the aforesaid automatically operating switches when all ofthe link connectors have been appropriated and operating to connect linkating switches for connecting calling telephone lines with idleoperators responsive devices; and additional automatically operatingswitches selectable by the aforesaid automatically operating switcheswhen "all of the responsive devices are in service and operating toconnect operators responsive devices with calling lines when suchoperators responsive devices are freed, there being means operated bythe additional auto matically operating switches for connecting theresponsive devices and link connectors with calling lines independentlyof the additional automatically operating switches.

S. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices; automatically operatingswitches for connecting calling telephone lines with idle operatorsresponsive devices; and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe responsive devices are in service and operating to connect operatorsresponsive devices with calling lines when such operators responsivedevices are freed, there being means operated by the additionalautomatically operating switches for connecting the responsive devicesand link connectors with calling lines independently of the additionalautomatically operating switches.

9. A telephone exchange system including telephone lines extending fromstations to an exchange; extensions for said telephone linesautomatically operating switches for connecting calling telephone lineswith said extensions; and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe line extensions have been approe priated and operating to connecttelephone line extensions with calling lines when such extensions arefreed, there being third automatically operating switches operated bythe additional or second automatically operating switches for connectingthe extensions.

with calling lines independently of said additional or secondautomaticallyv operating switches.

10. A telephone exchange system including telephone lines extending fromstations to an exchange; operators responsive devices; automaticallyoperating switches for connecting calling telephone lines with idleoperators responsive devices; and additional automatically operatingswitches selectable by the aforesaid automatically operating switcheswhen'all of the responsive devices are in service and operating toconnect operators responsive devices with calling lines when suchoperators responsive devices are freed, there being third automaticallyoperating switches operated by the additional or second automaticallyoperating switches for connecting the operators responsive devices withcalling lines independently of said additional or second automaticallyoperating switches.

11. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group; automatically opcrating switches for connectingcalling telephone lines with idle operators responslve devices; andadditional automatically op erating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive devices withcalling lines when such .operators responsive devices are freed, therebeing third automatically operating switches operated by the additionalor second automatically opera-ting switches for connecting theresponsive devices with calling lines independently of said additionalor second automatically operating switches.

12. A telephone exchange systemincluding telephone lines extending fromstations to an exchange; link connectors for constituting extensions ofcalling telephone lines and serving to connect calling telephone lineswith called telephone lines; automatically operating switches forselecting idle link connectors and connectingthem with calling telephonelines; and additional automatically operating switches selectable by theaforesaid automatically operating switches when all of the linkconnectors have been appropriated and operating to connect linkconnectors with calling lines when such link connectors are freed, therebeing third automatically operating switches operated by the additionalor sec- 0nd automatically operating switches for connecting the linkconnectors with calling lines independently of the additionalautomatically operating switches.

13. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group"; automatically operating switches for connectingcalling telephone lines with idle operators responsive devices; andadditional automatically operating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive devices'withcalling lines when such operators responsive devices are freed, therebeing third automatically operating switches operated by theadditionalor second automatically operating switches for connecting theresponsive devices and link connectors with calling lines independentlyof said additional or second automatically operating switches. I

14. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices; automatically operatingswitches for connecting calling telephone lines with idle operatorsresponsive devices; and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe responsive devices are in service and operating to connect operatorsresponsive devices with calling lines when such operators responsivedevices are freed, there being third automatically operating switchesoperated by the additional or second automatically operating switchesfor connecting the re-v sponsive devices and link connectors withcalling lines independently of the additional automatically operatingswitches.

15. A telephone exchange system including telephone lines extending fromstations to an exchange; extergions for said telephone lines;automatically operating switches for connecting calling telephone lineswith said extensions; and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe line extensions have been. appropriated and operating to connecttelephone line extensions with calling lines when such extensions arefreed, there being means operated by the additional automaticallyoperating switches for connecting the extensions with calling linesindependently of the' additional automatically operating switches, therealso being means governed by the aforesaid means for freeing theadditional automatically operating switches when they have operated fortheir purpose.

16. A telephone exchange system including telephone lines extending fromstations to an exchange; operators responsive devices; automaticallyoperating switches for connecting calling telephone lines with idleoperators responsive devices; and additional automatically operatingswitches selectable by the aforesaid automatically operating switcheswhen all of the responsive devices are in service and operating toconnect operators responsive devices with calling lines when suchoperators responsive devices are freed, there being means operated bythe additional automatically operating switches for connecting theoperators responsive devices with calling lines independently of theadditional automatically operating switches, there also being meansgoverned by the aforesaid means for freeing the additional automaticallyoperating switches when they have operated for their pur ose.

1 A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group; automatically oper ating switches for connectingcalling telephone lines with idle operators responsive devices; andadditional automatically operating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive devices withcalling lines when such operators responsive devices are freed, therebeing means operated by the additional automatically operating switchesfor connecting the responsive devlces with calling lines independentlyof the additional automatically operating switches, there also beingmeans governed by the aforesaid means for freeing the additionalautomatically operating switches when they have operated for theirpurpose.

18. A'telephone exchange system including telephone lines extending fromstations to an exchange; link connectors for constituting extensions ofcalling telephone lines and serving to connect calling telephone lineswith called telephone lines; automati cally operating switches forselecting idle link connectors and connectin them with calling telephonelines; and additional automatically operating switches selectable by theaforesaid automatically operating switches when all of the linkconnectors have been appropriated andoperating to connect linkconnectors with-callingvlines when such link connectors are freed, therebeingmeans operated by the additional automatically operating switchesfor connectng the lmk connectors with calling lines in ependently of theadditional automatically operating switches, there also being meansgoverned by the aforesaid means for freeing the additional automaticallyoperating switches when they have operated for their purpose.

SEIH

19. A telephone exchange system including telephone lines extendin'gfrom stations to an exchange; groups of link connectors for unitinglines in conversation; operators responsive devices each common to thelink connectors of a group; automatically operating switches forconnecting calling telephone lines with idle operators responsivedevices; and additional automatically operating switches selectable bythe aforesaid automatically operating switches when all of theresponsive devices are in service and operating to connect operatorsresponsive devices with calling lines when such operators responsivedevices are freed, there being means operated by the additionalautomatically operating switches for connecting the responsive devicesand link connectors with calling lines independently of the additionalautomatically operating switches,

there also being means governed by the aforesaid means for freeing theadditional automatically operating switches when they have operated forthis purpose.

20. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices; automatically operating 1 'iastgspmis'cr (tlEiBiEGl ,saan 1c nomnon: 1h t i Ikl l 31' ibis r ernedby the third automatically operating switches for freeing saidadditional or second automatically operating switches when they haveoperated for their purpose.

22. A telephone exchange system including telephone lines extending fromstations to an exchange; operators responsive devices; automaticallyoperating switches for connectingcalling telephone lines with idleoperators responsive device's and additional automatically operatingswitches selectable .switches for freeing said additional or secondautomatically operating switches when they have operated for theirpurpose.

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have been appropriated and operating to connect link connectors withcalling lines when such link connectors are freed, there being thirdautomatically operating switches operated by'the additional or secondautomatically operating switches for connecting the link connectors withcalling lines independently of the additional automatically operatingswitches, there being means governed by the third automaticallyoperating switches for freeing said additional or second automaticallyoperating switches when they have operated for their purpose.

25. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices each common to the linkconnectors of a group; automatically operating switches for connectingcalling telephone lines with idle operators responsive devices; andadditional automatically operating switches selectable by the aforesaidautomatically operating switches when all of the responsive devices arein service and operating to connect operators responsive de vices withcalling lines when such operators responsive devices are freed, therebeing third automatically operating switches operated by the additionalor second automatically operating switches for connecting the responsivedevices and link connectors with calling lines independently of saidadditional or second automatically operating switches, there being meansgoverned by the third automatically operating switches for freeing saidadditional or second automatically operating switches when they haveoperated for their purpose.

26. A telephone exchange system including telephone lines extending fromstations to an exchange; groups of link connectors for uniting lines inconversation; operators responsive devices; automatically operatingswitches for connecting calling telephone lines with idle operatorsresponsive devices and additional automatically operating switchesselectable by the aforesaid automatically operating switches when all ofthe responsive devices are in service and operating to connect operatorsresponsive devices with calling lines when such operators responsivedevices are freed, there being third automatically operating switchesoperated by the additional or second automatically operating switchesfor connecting the responsive devices and link connectors with callinglines independently of the additional automatically operating switches,there being means governed by the third automatically operating switchesfor freeing said additional or second automatically operating switcheswhen they have operated for their purpose.

In witness whereof, I hereunto subscribe my name this thirty-first dayof March,

MORTON L. JOHNSQN.

Witnesses:

G. L. GRAGG, E. L.

